<!-- 页头的模板 BEM命名 -->
<div class="header-container">
  <div class="header-logo">
    <a href="/index.html"><img src="./logo.svg" alt="" /></a>
  </div>
  <div class="header-nav">
    <a href="/index.html">首页</a>
    <a href="/about.html">关于</a>
  </div>
</div>
